TY - GEN
T1 - Trailing edge noise reduction through flexible serrations
AU - Zhou, Peng
AU - Liu, Qian
AU - Zhong, Siyang
AU - Zhang, Xin
N1 - Funding Information:
Peng Zhou wishes to thank The Hong Kong University of Science and Technology (HKUST) and Hong Kong RGC PhD Fellowship (reference number: PF16-01286) for supporting part of the PhD thesis research. This work is supported by the National Natural Science Foundation of China (NSFC: 11972029). This work was performed in Aerodynamics, Acoustics & Noise control Technology Centre (aantc.ust.hk).
Publisher Copyright:
© "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.
PY - 2021/7
Y1 - 2021/7
N2 - Inspired by the soft fringe structure of quiet-flying owls, we have conducted an experimental study on the effect of trailing edge serration flexibility on trailing edge noise reduction. The experiment was conducted in the HKUST low-speed anechoic wind tunnel, UNITED. A flat plate model was employed at zero angle of attack, and the chord-based Reynolds number ranged from 100,000 to 500,000. The far-field noise was measured through a 56-channel phased microphone array. The add-on type trailing edge serrations are made of polyethylene terephthalate (PET) sheets, and the flexibility of the serrations is controlled by the serration thickness. The effect of flexibility is found to be more significant at higher flow speeds. Compared with the rigid serrations, the most flexible serrations can achieve additional broadband noise reduction up to 2 dB at high frequencies. However, flutter may occur when the wind speed exceeds a critical value, leading to a drastic increment of the overall noise level. The mechanism of the extra noise reduction of flexible serrations is proposed as the better alignment of the flexible serrations to the undisturbed wake flow.
AB - Inspired by the soft fringe structure of quiet-flying owls, we have conducted an experimental study on the effect of trailing edge serration flexibility on trailing edge noise reduction. The experiment was conducted in the HKUST low-speed anechoic wind tunnel, UNITED. A flat plate model was employed at zero angle of attack, and the chord-based Reynolds number ranged from 100,000 to 500,000. The far-field noise was measured through a 56-channel phased microphone array. The add-on type trailing edge serrations are made of polyethylene terephthalate (PET) sheets, and the flexibility of the serrations is controlled by the serration thickness. The effect of flexibility is found to be more significant at higher flow speeds. Compared with the rigid serrations, the most flexible serrations can achieve additional broadband noise reduction up to 2 dB at high frequencies. However, flutter may occur when the wind speed exceeds a critical value, leading to a drastic increment of the overall noise level. The mechanism of the extra noise reduction of flexible serrations is proposed as the better alignment of the flexible serrations to the undisturbed wake flow.
KW - Compliant airfoil
KW - Reconfiguration
KW - Trailing edge niose
KW - Trailing edge serrations
UR - http://www.scopus.com/inward/record.url?scp=85117531728&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85117531728
T3 - "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021
BT - "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021
A2 - Carletti, Eleonora
A2 - Crocker, Malcolm
A2 - Pawelczyk, Marek
A2 - Tuma, Jiri
PB - Silesian University Press
T2 - 27th International Congress on Sound and Vibration, ICSV 2021
Y2 - 11 July 2021 through 16 July 2021
ER -